Skip to content
Heist/ feed
Back to feed
Medium

Open redirect in MISP dashboard button widget URL handling

Type: advisorySources: OSV

A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\, and by emitting only the reconstructed validated URL in the anchor href.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-10856
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 19:02 UTC · Revision 1

Source evidence

Open redirect in MISP dashboard button widget URL handling

core-osv · Original source

Published 4 Jun 2026, 13:17 UTC

A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\, and by emitting only the reconstructed validated URL in the anchor href.

osv:CVE-2026-10856
Complete source record
{
  "id": "fbc7dd272097f66868f1eed3c071a84e53979a73ca68e4080779cad98e68bd37",
  "url": "https://osv.dev/vulnerability/CVE-2026-10856",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open redirect in MISP dashboard button widget URL handling",
    "summary": "A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\\, and by emitting only the reconstructed validated URL in the anchor href.",
    "evidence": "osv:CVE-2026-10856",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-10856",
      "aliases": [
        "CVE-2026-10856"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/U:Green"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/misp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "82e9c4f22879e3f32f60f5857aac0e829152bc76"
                },
                {
                  "fixed": "f879f16fb5db7a9aab0a70fdcafea12ce4847e9a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.5.39"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f879f16fb5db7a9aab0a70fdcafea12ce4847e9a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.5.37",
            "v2.5.36",
            "v2.5.35",
            "v2.5.34",
            "v2.5.33",
            "v2.5.32",
            "v2.5.31",
            "v2.5.30",
            "v2.5.29",
            "v2.5.28",
            "v2.5.27",
            "v2.5.26",
            "v2.5.25",
            "v2.5.24",
            "v2.5.23",
            "v2.5.22",
            "v2.5.21",
            "v2.5.20",
            "v2.5.19",
            "v2.5.18",
            "v2.5.17",
            "v2.5.16",
            "v2.5.15",
            "v2.5.12",
            "v2.5.14",
            "v2.5.13",
            "v2.5.11",
            "v2.5.10",
            "v2.5.9",
            "v2.5.8",
            "v2.5.7",
            "v2.5.0",
            "v2.4.196",
            "v2.4.195",
            "v2.4.194",
            "v2.4.193",
            "v2.4.192",
            "v2.4.191",
            "v2.4.190",
            "v2.4.189",
            "v2.4.188",
            "v2.4.187",
            "v2.4.186",
            "v2.4.175",
            "v2.4.185",
            "v2.4.183",
            "v2.4.184",
            "v2.4.153",
            "v2.4.152",
            "v2.4.137",
            "v2.4.136",
            "v2.4.134",
            "v2.4.133",
            "v2.4.130",
            "v2.4.128",
            "v2.4.127",
            "v2.4.125",
            "v2.4.123",
            "v2.4.122",
            "v2.4.121",
            "v2.4.120",
            "v2.4.118",
            "v2.4.111",
            "rm",
            "v2.4.110",
            "v2.4.109",
            "codename/tellurium",
            "v2.4.107",
            "v2.4.106",
            "v2.4.102",
            "v2.4.101",
            "v2.4.100",
            "v2.4.98",
            "v2.4.96",
            "v2.4.95",
            "v2.4.94",
            "v2.4.93",
            "v2.4.91",
            "v2.4.89",
            "v2.4.88",
            "v2.4.87",
            "v2.4.86",
            "v2.4.85",
            "v2.4.83",
            "v2.4.82",
            "v2.4.80",
            "v2.4.78",
            "v2.4.65",
            "v2.4.64",
            "v2.4.63",
            "v2.4.62",
            "v2.4.61",
            "v2.4.60",
            "v2.4.59",
            "v2.4.58",
            "v2.4.57",
            "v2.4.56",
            "v2.4.54",
            "v2.4.53",
            "v2.4.52",
            "v2.4.51",
            "v2.4.50",
            "v2.4.48",
            "v2.4.47",
            "v2.4.46",
            "v2.4.45",
            "v2.4.43",
            "v2.4.39",
            "v2.4.38",
            "v2.4.37",
            "v2.4.36",
            "v2.4.35",
            "v2.4.34",
            "v2.4.27",
            "v2.4.26",
            "v2.4.25",
            "v2.4.24",
            "v2.4.23",
            "v2.4.22",
            "v2.4.21",
            "v2.4.20",
            "v2.4.18",
            "v2.4.17",
            "v2.4.16",
            "v2.4.15",
            "v2.4.14",
            "v2.4.13",
            "v2.4.11",
            "v2.4.10",
            "v2.4.9",
            "v2.4.7",
            "v2.4.5",
            "v2.4.4",
            "v2.4.3",
            "v2.4.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.0",
            "v0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10856.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.837825589Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10856.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-10856",
        "https://github.com/MISP/MISP/commit/f879f16fb5db7a9aab0a70fdcafea12ce4847e9a"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-601"
        ],
        "cna_assigner": "CIRCL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10856.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-10856",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520171,
  "published_at": "2026-06-04T13:17:47.91+00:00"
}